White noise for babies
Steady sound can help many babies settle and stay asleep through household noise. Here is what the research shows, which sounds parents reach for, and how to keep the volume safe.
Short answer: white noise can help many babies fall asleep faster and sleep through sudden household sounds. Keep it low (around the level of a soft shower at your baby's head), keep the phone across the room, and prefer a timer that fades out rather than loud sound all night.
Why steady sound helps babies settle
A womb is not quiet. Before birth a baby hears blood flow, a heartbeat and muffled voices all day, so a silent room can be the unusual thing. Steady sound also masks the sudden noises that wake light sleepers: a door, a barking dog, a sibling, a delivery van. The sound itself does not put a baby to sleep; it smooths the background so small noises stand out less.
What the research says
- Newborns fell asleep faster. In a 1990 trial of 40 newborns aged 2 to 7 days, 16 of 20 babies (80%) fell asleep within five minutes of hearing white noise, compared with 5 of 20 (25%) who fell asleep on their own. The authors suggested white noise may help parents settle difficult babies. (Spencer et al., Archives of Disease in Childhood, 1990.)
- Machines can be too loud. A 2014 study tested 14 infant sleep machines at full volume. All of them were louder than 50 dBA, the average limit used for hospital nurseries, when measured 30 cm away, and three exceeded 85 dBA, a level linked to hearing damage with long exposure. The researchers advised placing machines as far from the baby as possible, never in the cot, at the lowest volume and for short periods. (Hugh et al., Pediatrics, 2014.)
- The overall evidence is still thin. A 2021 review of 38 studies on continuous noise as a sleep aid rated the quality of evidence as very low and called for more research. White noise is a comfort tool, not a treatment. (Riedy et al., Sleep Medicine Reviews, 2021.)
How to use white noise safely
| Check | What to do |
|---|---|
| Volume | Start at the lowest setting and raise it only until household noise softens. At your baby's head it should sound like a soft shower, not a hair dryer. |
| Distance | Put the phone across the room. Never in the cot, on the rail or under the mattress. |
| Duration | Use a timer that fades out after your baby is asleep, or keep all-night sound quiet. |
| Night feeds | Use a dim screen so checking the phone does not light up the room. |
Sounds parents use for babies in HushNest
- Womb and Heartbeat: a muffled whoosh and slow beat, close to what a newborn heard before birth. Both are free.
- Shush: a soft, rhythmic "shhh", the sound parents make anyway, on a loop.
- White noise, Fan and Hair Dryer: steady hums that cover household noise. All free.
- Lullaby and Music Box: gentle melodies for the wind-down before the steady sound takes over.
In HushNest you can layer up to four of these, for example heartbeat under soft rain, and save the mix. The sleep timer runs from 15 minutes to 2 hours and fades the sound out slowly, so the room drifts into quiet instead of snapping to silence. A one-tap bedtime routine can play a lullaby, then white noise, each for the time you choose.
Sources
- Spencer JA, Moran DJ, Lee A, Talbert D. White noise and sleep induction. Arch Dis Child. 1990;65(1):135-137. doi:10.1136/adc.65.1.135
- Hugh SC, Wolter NE, Propst EJ, Gordon KA, Cushing SL, Papsin BC. Infant sleep machines and hazardous sound pressure levels. Pediatrics. 2014;133(4):677-681. doi:10.1542/peds.2013-3617
- Riedy SM, Smith MG, Rocha S, Basner M. Noise as a sleep aid: a systematic review. Sleep Med Rev. 2021;55:101385. doi:10.1016/j.smrv.2020.101385
Questions people ask
Is it OK to play white noise all night for a baby?
Researchers who measured infant sleep machines advise using the lowest volume and running sound for a short time rather than all night. A timer that fades out once your baby is asleep is a sensible middle ground. If you do play it longer, keep it quiet and far from the cot.
How loud should white noise be for a baby?
Quieter than most parents expect: roughly the level of a soft shower or quiet conversation, measured where your baby's head is. Hospital nurseries aim for about 50 dBA on average. Set your phone low, place it across the room, and check it with a free sound-meter app.
Where should I put the phone or sound machine?
Across the room, never in the cot, on the cot rail or next to your baby's head. Sound gets much quieter with distance, and the phone stays out of the sleep space.
Which sound is best for a newborn?
Many parents start with sounds close to what a baby heard before birth: womb, heartbeat or a soft shush. White or pink noise and a fan are good steady alternatives. Babies differ, so try one for a few nights before switching.
Will my baby become dependent on white noise?
Some babies get used to it as a sleep cue, much like a bedtime routine. If you want to wean off, lower the volume a little each week or use a shorter fade-out timer.
Try HushNest tonight
Free on Android and iPhone, with no account needed. On the App Store it is listed as HushBaby: Baby Sleep Sounds.
